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MARKETABLE SECURITIES
9 Months Ended
Sep. 30, 2021
Cash and Cash Equivalents [Abstract]  
Marketable Securities MARKETABLE SECURITIES
The following table summarizes our marketable securities by significant investment categories as of September 30, 2021:
 Cost BasisGross Unrealized LossesGross Unrealized GainsFair Value
Marketable equity securities$756 $(224)$$535 

The following table summarizes our marketable securities by significant investment categories as of December 31, 2020:
 Cost BasisGross Unrealized LossesGross Unrealized GainsFair Value
Marketable equity securities$824 $(418)$1,841 $2,247